CN113157022B - Perioperative patient heating system and method - Google Patents
Perioperative patient heating system and method Download PDFInfo
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- CN113157022B CN113157022B CN202110154300.5A CN202110154300A CN113157022B CN 113157022 B CN113157022 B CN 113157022B CN 202110154300 A CN202110154300 A CN 202110154300A CN 113157022 B CN113157022 B CN 113157022B
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- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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Abstract
The invention provides a perioperative patient heating system and a perioperative patient heating method, which comprise a heating pad and a controller; a patient heating area and a temperature measuring area are arranged on the heating pad; the temperature measuring area is connected with the patient warming area but is not overlapped; the heating pad is internally provided with a heating element which is used for heating a heating area and a temperature measuring area of a patient; a plurality of layers of heat-insulating layers and at least one temperature sensor are arranged above the temperature measuring area, and the temperature sensor is used for measuring the temperature of the temperature measuring area; the controller is respectively connected with the heating pad and the temperature sensor. According to the body mass index BMI of different patients, the number of the heat-insulating layers in the temperature measuring area is correspondingly adjusted, so that the temperature measured by the temperature sensor in the area is accurately equal to the temperature of the heating area of the patient, the aim of indirect temperature measurement is fulfilled, and the temperature sensor in the heating pad and the connecting line thereof can be ensured not to influence X-ray scanning perspective imaging.
Description
Technical Field
The invention belongs to the technical field of medical equipment intelligence, and particularly relates to a perioperative patient heating system and an implementation method thereof.
Background
The patient is weak during the operation, and the metabolism level in the body is reduced to the minimum due to the effect of the anesthetic, so that the normal body temperature is difficult to maintain. Perioperative hypothermia can cause a variety of complications, such as impaired blood coagulation mechanism, reduced drug metabolism rate, reduced immunity, prolonged wound healing time, increased infection rate, delayed postoperative recovery of the patient, and severe cardiopulmonary disorders. Effective monitoring and adjustment of body temperature is one of effective measures for ensuring successful operation and reducing postoperative complications.
Perioperative patient heating system is to heat up patient perioperatively, carries out the heat exchange through the contact of heating pad surface and patient's health to reach and control patient's body temperature, and can effectively keep perioperative patient normal body temperature's purpose. Because the imaging devices such as X-ray scanning fluoroscopy and the like need to be used in a matching manner in the operation process, when a patient lies on the heating pad, the temperature sensor and the connecting line thereof under the patient are not suitable for diagnosis and imaging, the image is blurred and partially shielded, and a doctor cannot make accurate judgment according to the image. Therefore, in order to achieve the good effect of X-ray scanning fluoroscopy imaging, a perioperative patient heating system which does not interfere with diagnostic imaging and can be matched with an operating room is necessary. And from the safe angle, carry on the accurate control to the temperature; from the use perspective, it is also necessary to build a good human interface.
Disclosure of Invention
Aiming at the technical problem, the invention provides a perioperative patient heating system and an implementation method thereof, which can accurately control the temperature, can be matched with X-ray scanning perspective imaging and have a good human-computer interaction interface. The controller outputs adjustable voltage to heat the heating element, so that the safety of the system is ensured; the fuzzy self-adaptive PID algorithm of the neural network is adopted to accurately control the temperature; and a good man-machine interaction function is achieved by adopting the touch screen.
The technical scheme of the invention is as follows: a perioperative patient heating system comprises a heating pad and a controller; a patient heating area and a temperature measuring area are arranged on the heating pad; the temperature measuring area is connected with the patient warming area but is not overlapped; the heating pad is internally provided with a heating element which is used for heating a heating area and a temperature measuring area of a patient; a plurality of layers of heat-insulating layers and at least one temperature sensor are arranged above the temperature measuring area, and the temperature sensor is used for measuring the temperature of the temperature measuring area; the controller is respectively connected with the heating pad and the temperature sensor.
In the scheme, the controller adjusts the number of the heat-insulating layers according to the BMI (body mass index) of the patient;
the relationship between the body mass index BMI and the back temperature of the patient to be tested is as follows: let y1＝f1(x1)，y1Is temperature, x1Is body mass index BMI, f1As a corresponding function of temperature and BMI index;
the corresponding relation between the temperature of the heating pad and the heat insulation layer is as follows: let y2＝f2(x2)，y2Is temperature, x2Number of layers of heat-insulating layer f2Is a corresponding function of temperature and the number of layers of the heat insulation layer;
let y1＝y2I.e. f1(x1)＝f2(x2) To solve for x2＝f3(x1) Where f is3Is a corresponding function of the body mass index BMI and the number of layers of the heat-insulating and heat-preserving layer, therefore, when the body mass index BMI is known, the required heat insulation can be calculatedAnd the number of the insulating layers is increased.
In the above scheme, a plurality of temperature sensors are arranged in the temperature measuring area; the temperature values detected by the plurality of temperature sensors are transmitted to the controller, and the controller averages the plurality of temperature values.
In the above scheme, the heating element in the heating pad adopts carbon fiber heating cloth.
In the scheme, the controller comprises a power supply module, an adjustable voltage module, a relay module, a Micro Control Unit (MCU), an isolation circuit, a storage circuit, an alarm circuit and a touch screen;
the power supply module is used for providing power supply for the system;
the adjustable voltage module is used for outputting adjustable direct current voltage to supply power to the heating pad;
the micro control unit MCU is used for temperature control;
the isolation circuit is used for isolating the MCU from an input signal or an output signal;
the storage circuit is used for storing data;
the alarm circuit is used for giving an alarm when the temperature value detected by the temperature sensor exceeds an alarm preset temperature value, and the relay module is used for cutting off the power supply at the moment;
the touch screen is used for setting and displaying the temperature of the heating pad.
Further, an adjustable voltage module in the controller outputs 0-24V adjustable direct current voltage to supply power to the heating pad.
Furthermore, a temperature control module in the controller adopts a neural network fuzzy self-adaptive PID algorithm to control the temperature.
In the above scheme, the temperature sensor is an NTC thermistor sensor.
A method according to the perioperative patient warming system, comprising the steps of:
the body weight and height information of a patient are input into the controller to obtain the body mass index BMI of the patient, the temperature sensor measures the temperature of the temperature measurement area and transmits the temperature to the controller, the number of layers of the heat insulation layer is obtained according to the body mass index BMI and the corresponding function of the number of layers of the heat insulation layer, and the heat insulation layer with the corresponding number of layers is placed in the temperature measurement area.
In the above scheme, the method further comprises the following steps: heating is carried out by setting heating temperature through a touch screen of the controller, when the temperature difference between the temperature of a temperature measurement area measured by a temperature sensor and the set heating temperature is N degrees or more, wherein N is the degree of the temperature, the controller outputs 24V direct current voltage to supply power to the heating element, and the duty ratio of PWM (pulse-width modulation) waves output by a Micro Control Unit (MCU) of the controller is 100%; when the difference between the temperature of the temperature measurement area measured by the temperature sensor and the set heating temperature is less than N degrees, the controller adopts a neural network fuzzy adaptive PID control algorithm, feeds back the temperature to the micro control unit MCU in combination with the temperature sensor, and controls the temperature value of the heating pad by adjusting the PWM wave duty ratio output by the micro control unit MCU, thereby outputting 0-24V adjustable voltage to supply power to the heating element;
when the temperature value detected by the temperature sensor exceeds the alarm preset temperature value, an alarm circuit of the controller gives an alarm, and at the moment, the relay module cuts off the power supply.
Compared with the prior art, the invention has the beneficial effects that: the perioperative patient heating system is reasonable in structural design, can be used for heating patients in perioperative period, divides the heating pad into a patient heating area and a temperature measuring area, and does not influence diagnostic imaging when X-ray scanning fluoroscopy is carried out on the patients in the operative process; the neural network fuzzy self-adaptive PID algorithm is adopted in the controller to control the temperature, so that the temperature control precision of the perioperative patient heating system is improved; the heating element is heated and controlled by adopting the 0-24V direct-current adjustable voltage module and the relay module, the safety of the perioperative patient heating system is improved, a human interface is built by adopting the touch screen, and the user operation experience is improved.
Drawings
FIG. 1 is a schematic top view of a perioperative patient warming system according to one embodiment of the present invention;
FIG. 2 is a schematic side view of a perioperative patient warming system in accordance with one embodiment of the present invention;
FIG. 3 is a block diagram of the control system components of one embodiment of the present invention;
FIG. 4 is an adjustable voltage module according to an embodiment of the present invention;
FIG. 5 is a first touch screen interface diagram of an embodiment of the present invention;
FIG. 6 is a second diagram of a touch screen interface in accordance with an embodiment of the present invention.
In the figure, the heating pad 1, the heating pad 2, the controller 3, the patient warming area 4, the temperature measuring area 5, the temperature sensor 6, the heat insulation layer 7 and the heating wire are arranged.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 and 2, a preferred embodiment of the perioperative patient warming system of the present invention is shown, comprising a heating pad 1 and a controller 2; a patient heating area 3 and a temperature measuring area 4 are arranged on the heating pad 1; the temperature measuring area 4 is connected with the patient warming area 3 but is not overlapped; a heating element is arranged in the heating pad 1 and used for heating the heating area 3 and the temperature measuring area 4 of the patient; a plurality of layers of heat insulation layers 6 and at least one temperature sensor 5 are arranged above the temperature measurement area 4, and the temperature sensor 5 is used for measuring the temperature of the heat insulation layers 6 of the temperature measurement area 4; the controller 2 is respectively connected with the heating mat 1 and the temperature sensor 5 through a heating wire 7.
The vertical dashed line in fig. 1, marked with reference character a, symbolically represents the separation limit between the patient warming zone 3 and the temperature measurement zone 4. The heating element is disposed in the heating mat 1 and extends into the patient warming zone 3 and the temperature measurement zone 4. The temperature sensor 5 located in the temperature measuring zone 4 is arranged directly below the additional insulating layer 6.
The controller 2 adjusts the number of the heat-insulating layers 6 according to the BMI (body mass index) of the patient, and can indirectly measure the temperature of the heating area 3 of the patient; the relationship between the body mass index BMI and the back temperature of the patient to be tested is as follows: let y1＝f1(x1)，y1Is temperature, x1Is body mass index BMI, f1As a corresponding function of temperature and BMI index;
the corresponding relation between the temperature of the heating pad 1 and the heat insulation layer 6 is as follows: let y2＝f2(x2)，y2Is temperature, x2For heat insulationNumber of warm layers 6, f2Is a corresponding function of the temperature and the number of layers of the heat insulation layer 6;
let y1＝y2I.e. f1(x1)＝f2(x2) To solve for x2＝f3(x1) Where f is3Is a corresponding function of the body mass index BMI and the number of layers of the heat-insulating and heat-preserving layer 6, therefore, when the body mass index BMI is known, the number of layers of the heat-insulating and heat-preserving layer 6 can be calculated.
According to this embodiment, specifically, the thermal conductivity of people with different fat and thin portions has a certain difference, the back fat layer is thicker, the thermal resistance is larger, and therefore the thermal conductivity is smaller. Meanwhile, when people with different fat and thin degrees lie down, the pressure at the contact position of the back and the heating pad is different, so that the heat dissipation performance at the position is different, and the temperature is also different. Therefore, the people to be measured with different body types can be classified according to the corresponding relation of weight and height, the people can be heated for the same time at the same room temperature, and the temperature of the back when the people lie down can be measured.
The body quality index BMI is used for classification, and is an important standard which is commonly used internationally for measuring the obesity degree of the human body. The judgment of the obesity degree of a person cannot be judged only according to the weight and is related to the height. The BMI obtains a relatively objective parameter through two values of the weight and the height of the human body, and effectively embodies the fat content of the human body.
BMI ═ weight (kg) × 10000/height2(cm2)
Wherein the Chinese reference standard is as follows: <18.5 is lean, between 18.5 and 23.9 is normal, > 24 is overweight, and > 28 is obese. In the experimental process, the room temperature and the heating time in the multiple experimental processes are required to be kept consistent, the temperature of the personnel with the body mass index BMI distributed in each interval is measured, and data fitting is carried out on experimental data to obtain the relationship between the BMI index and the back temperature of the tested personnel.
In the temperature measurement area 4, the thermal insulation material needs to be light and thin and has moderate thermal insulation performance, and if a material with too good thermal insulation performance is adopted, the temperature at the position is higher, the number of layers of the thermal insulation material is not convenient to adjust, and the experiment is inconvenient. On the other hand, if a material with poor heat insulation performance is used, the number of layers or the thickness of the material is too large. Therefore, it is necessary to perform comparative experiments on a plurality of heat insulating materials to find the most suitable one. In the experiment process, the same room temperature and heating time as those in the experiment are kept, the number of layers of the heat insulation layer 6 is adjusted, the temperature of the corresponding heating pad 1 is measured, and the corresponding relation between the temperature and the number of layers of the heat insulation material can be obtained through multiple experiments.
By combining the two experiments, the relationship between the back temperature of the BMI patient with different body mass indexes when the BMI patient lies down and is heated and the number of layers of the heat insulation layer 6 in the temperature measurement area 4 can be finally established, and the purpose of simulating the temperature of the patient by using the number of the heat insulation layers 6 is achieved.
A plurality of temperature sensors 5 are arranged in the temperature measuring area 4; the temperature values detected by the plurality of temperature sensors 5 are transmitted to the controller 2, and the controller 2 averages the plurality of temperature values. Preferably, the number of the temperature sensors 5 is three; the three temperature sensors 5 are evenly distributed in the temperature measuring region 4.
The heating pad 1 can be made of a non-woven fabric material, the heating element is integrated in the heating pad 1, the heating element can be made of carbon fiber cloth which is transparent to X rays and has low magnetic reducibility, and the diagnostic imaging cannot be influenced. The patient warming zone 3 contains only materials suitable for diagnostic imaging. Preferably, the heating element in the heating mat 1 is a carbon fiber heating cloth. The heating element heats the temperature measurement zone 4 and the patient warming zone 3 in a uniform manner.
As shown in fig. 3, the controller 2 includes a control switch, a power supply module, an adjustable voltage module, a relay module, a micro control unit MCU, an environment temperature and humidity measuring module, an isolation circuit, a storage circuit, an alarm circuit, and a touch screen; the power supply module is used for providing power supply for the system; the adjustable voltage module is used for outputting adjustable direct current voltage to supply power to the heating pad 1; the micro control unit MCU is used for temperature control; the environment temperature and humidity measuring module is used for detecting the temperature and the humidity of the environment; the isolation circuit is used for isolating the MCU from an input signal or an output signal; the storage circuit is used for storing data; the alarm circuit is used for giving an alarm when the temperature value detected by the temperature sensor 5 exceeds an alarm preset temperature value, and the relay module is used for cutting off the power supply at the moment; the touch screen is used for inputting and displaying data.
As shown in fig. 4, according to the present embodiment, the adjustable voltage module in the controller 2 preferably outputs an adjustable dc voltage of 0-24V to power the heating pad 1, so as to obtain a temperature of typically 35-40 ℃ to heat the patient.
According to the present embodiment, preferably, the temperature control module in the controller 2 performs temperature control by using a neural network fuzzy adaptive PID algorithm.
According to the present embodiment, preferably, the temperature sensor 5 is an NTC thermistor sensor. The resistance of the NTC thermistor sensor decreases with increasing temperature, and its conductivity is better at high temperature than at low temperature. A plurality of layers of heat insulating layers 6 are arranged above the temperature sensor 5. By adjusting the number of the thermal insulation layers 6, the temperature measured by the temperature sensor 5 can be exactly equal to the temperature felt by the patient in the patient warming area 3. Thus, the temperature need not be measured directly on the patient. In the warming process, the patient is required to lie in the warming area 3 of the patient.
To the patient of different sizes, can adopt patient's health quality index BMI to classify it, obtain the relation of patient's health quality index BMI and thermal-insulated heat preservation 6 quantity through a series of experiments, when heating to the patient of different patient's health quality index BMI, can correspond the quantity of adjustment thermal-insulated heat preservation 6, reach the purpose of accurate indirect temperature measurement. When the heating pad 1 is preheated and a patient does not lie in the patient warming region 3, the temperature measuring region 4 is not provided with the heat insulating layer 6, and the temperature measured by the temperature sensor 5 is equal to the actual temperature of the patient warming region 3. When a patient lies in the patient warming area 3, according to the relationship between the number of the calibrated heat insulation layers 6 and the body mass index BMI of the patient, the corresponding number of layers of heat insulation layers 6 are placed in the temperature measurement area 4, and the temperature measured by the temperature measurement area 4 is exactly equal to the temperature of the patient warming area 3.
A method according to the perioperative patient warming system, comprising the steps of:
the body weight and the height information of a patient are input into the controller 2 to obtain the body mass index BMI of the patient, the temperature sensor 5 measures the temperature of the temperature measurement area 4 and transmits the temperature to the controller 2, the number of layers of the heat insulation layer 6 is obtained according to the body mass index BMI and the corresponding function of the number of layers of the heat insulation layer 6, and the heat insulation layer 6 with the corresponding number of layers is placed in the temperature measurement area 4.
In the above scheme, the method further comprises the following steps: heating is carried out by setting heating temperature through a touch screen of the controller 2, when the temperature difference between the temperature of the temperature measurement area 4 measured by the temperature sensor 5 and the set heating temperature is N degrees or more, wherein N is the degree of the temperature, the controller 2 outputs 24V direct-current voltage to supply power to the heating element, and the duty ratio of PWM (pulse-width modulation) waves output by a Micro Control Unit (MCU) of the controller 2 is 100 percent; when the temperature difference between the temperature of the temperature measurement area 4 measured by the temperature sensor 5 and the set heating temperature is less than N degrees, the controller 2 adopts a neural network fuzzy self-adaptive PID control algorithm, combines the temperature value fed back to the heating pad 1 of the micro control unit MCU by the temperature sensor 5, and controls the temperature value of the heating pad 1 by adjusting the PWM wave duty ratio output by the micro control unit MCU, thereby outputting 0-24V adjustable voltage to supply power to the heating element; when the temperature value detected by the temperature sensor 5 exceeds the alarm preset temperature value, the alarm circuit of the controller 2 gives an alarm, and at the moment, the relay module cuts off the power supply.
According to the embodiment, preferably, as shown in fig. 5, a user sets a heating target temperature through a touch screen and clicks a heating button, when a difference between the set target temperature and the current temperature of the heating pad is greater than 5 ℃, the controller outputs 24V of direct current voltage to supply power to the heating element, and at this time, the duty ratio of the PWM wave output by the micro control unit MCU is 100%; when the difference value is less than 5 ℃, the controller adopts a neural network fuzzy self-adaptive PID control algorithm, and adjusts the PWM wave duty ratio output by the MCU by combining the temperature value fed back to the heating pad of the MCU by the temperature sensor, thereby outputting 0-24V adjustable voltage to supply power to the heating element and achieving the aim of accurate temperature control. The external relay module is used for protecting to prevent the power supply from being cut off in time when the temperature is too high due to the failure of the adjustable voltage module; an additional alarm circuit can give out alarm sound when the temperature is too high due to system failure, and remind a user to cut off the main power supply in time.
As shown in fig. 6, the touch screen of the controller can be used for the user to set the target temperature of the heating system, check the temperature of the heating mat 1 and the temperature and humidity of the environment, and check the real-time temperature change curve of the heating mat 1.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. A perioperative patient heating system is characterized by comprising a heating pad (1) and a controller (2); a patient warming area (3) and a temperature measuring area (4) are arranged on the heating pad (1); the temperature measuring area (4) is connected with the patient warming area (3) but is not overlapped; a heating element is arranged in the heating pad (1), and the heating element is used for heating the heating area (3) and the temperature measuring area (4) of the patient; a plurality of layers of heat-insulating layers (6) and at least one temperature sensor (5) are arranged above the temperature measuring area (4), and the temperature sensor (5) is used for measuring the temperature of the temperature measuring area (4); the controller (2) is respectively connected with the heating pad (1) and the temperature sensor (5);
the controller (2) adjusts the number of the heat-insulating layers (6) according to the BMI (body mass index) of the patient;
the relationship between the body mass index BMI and the back temperature of the patient to be tested is as follows: let y1＝f1(x1)，y1Is temperature, x1Is the bodyQuality index BMI, f1As a corresponding function of temperature and BMI index;
the corresponding relation between the temperature of the heating pad (1) and the heat insulation layer (6) is as follows: let y2＝f2(x2)，y2Is temperature, x2The number of layers of the heat insulation layer (6) is f2Is a corresponding function of the temperature and the number of layers of the heat insulation layer (6);
let y1＝y2I.e. f1(x1)＝f2(x2) To solve for x2＝f3(x1) Where f is3Is a corresponding function of the body mass index BMI and the number of layers of the heat-insulating and heat-preserving layer (6), therefore, when the body mass index BMI is known, the number of layers of the heat-insulating and heat-preserving layer (6) can be calculated.
2. Perioperative patient warming system according to claim 1, wherein a plurality of temperature sensors (5) are built in the temperature measuring zone (4); the temperature values detected by the plurality of temperature sensors (5) are transmitted to the controller (2), and the controller (2) averages the plurality of temperature values.
3. Perioperative patient warming system according to claim 1, wherein the heating elements in the heating pad (1) are carbon fiber heating cloth.
4. The perioperative patient warming system according to claim 1, wherein the controller (2) comprises a power module, an adjustable voltage module, a relay module, a Micro Control Unit (MCU), an isolation circuit, a storage circuit, an alarm circuit and a touch screen;
the power supply module is used for providing power supply for the system;
the adjustable voltage module is used for outputting adjustable direct current voltage to supply power to the heating pad (1);
the micro control unit MCU is used for temperature control;
the isolation circuit is used for isolating the MCU from an input signal or an output signal;
the storage circuit is used for storing data;
the alarm circuit is used for giving an alarm when the temperature value detected by the temperature sensor (5) exceeds an alarm preset temperature value, and the relay module is used for cutting off the power supply at the moment;
the touch screen is used for setting and displaying the temperature of the heating pad (1).
5. Perioperative patient warming system according to claim 4, wherein the adjustable voltage module in the controller (2) outputs an adjustable DC voltage of 0-24V to power the heating pad (1).
6. Perioperative patient warming system according to claim 4, wherein the temperature control module within the controller (2) employs a neural network fuzzy adaptive PID algorithm for temperature control.
7. Perioperative patient warming system according to claim 1, wherein the temperature sensor (5) is an NTC thermistor sensor.
8. A method of implementing a perioperative patient warming system according to any of claims 1-7, comprising the steps of:
the body weight and the height information of a patient are input into the controller (2) to obtain the body mass index BMI of the patient, the temperature sensor (5) measures the temperature of the temperature measurement area (4) and transmits the temperature to the controller (2), the number of layers of the heat insulation layer (6) is obtained according to the body mass index BMI and the corresponding function of the number of layers of the heat insulation layer (6), and the heat insulation layer (6) with the corresponding number of layers is placed in the temperature measurement area (4).
9. The method of claim 8, further comprising the steps of: heating is carried out by setting heating temperature through a touch screen of the controller (2), when the temperature difference between the temperature of the temperature measurement area (4) measured by the temperature sensor (5) and the set heating temperature is N degrees or more, wherein N is the degree of the temperature, the controller (2) outputs 24V direct current voltage to supply power to the heating element, and the duty ratio of PWM (pulse-width modulation) waves output by a Micro Control Unit (MCU) of the controller (2) is 100%; when the temperature difference between the temperature of the temperature measurement area (4) measured by the temperature sensor (5) and the set heating temperature is less than N degrees, the controller (2) adopts a neural network fuzzy self-adaptive PID control algorithm, and adjusts the PWM wave duty ratio output by the micro control unit MCU to control the temperature value of the heating pad (1) by combining the temperature value fed back to the heating pad (1) of the micro control unit MCU by the temperature sensor (5), so that 0-24V adjustable voltage is output to supply power to the heating element;
when the temperature value detected by the temperature sensor (5) exceeds the alarm preset temperature value, the alarm circuit of the controller (2) gives an alarm, and the relay module cuts off the power supply at the moment.
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| CN110770844A (en) * | 2017-06-23 | 2020-02-07 | 3M创新有限公司 | Patient warming system with monitoring and feedback functions |
| CN209895203U (en) * | 2019-07-30 | 2020-01-03 | 江苏佰润医疗科技有限公司 | Multi-path regional heating system for patient heating control |
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